Recently I wrote about the indefatigable, on-the-field leadership of Ray Lewis, the inside linebacker for the Baltimore Ravens who is responsible, in part, for the team winning Super Bowl XLVII and who is retiring after 17 years of all-star service to the game.

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There are, however, no interference problems with field-emission X-ray sources, so these can be used to take high-resolution pictures while treatment is proceeding.

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Denver Broncos quarterback Peyton Manning shook off his neck brace and passed for more than 4, 000 yards, Minnesota running back Adrian Peterson jumped off the operating table and produced the second-highest rushing total in history, and Ravens linebacker Ray Lewis returned to the field just 12 weeks after tearing his triceps.

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"An X-ray taken immediately after John left the field did not show the injury, " added English.

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He currently sits alongside club legends Emlyn Hughes and Ray Clemence and if he takes the field against Fulham at the weekend, he will move into clear second, with only Ian Callaghan ahead of him on 857.

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His first company--launched in his mid 20s--made software for X-ray imaging machines and, later, for laptop computers that helped field technicians troubleshoot glitches in large equipment made by the likes of Xerox and Siemens.

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His first company--launched in his mid 20s--made software for X-ray imaging machines and, later, for laptop computers that helped field technicians troubleshoot glitches in large equipment made by the likes of Xerox (nyse: XRX - news - people ) and Siemens.

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But gamma-ray telescopes are also confused by charged particles trapped in the earth's magnetic field.

ECONOMIST: A new gamma-ray telescope has just been launched

After a Ray Rice fumble gave the ball back to the 49ers, Akers kicked his third field goal of the contest.

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